OT: difficulty with moving server

Eduardo Casarero ecasarero at gmail.com
Thu Apr 15 18:26:30 IST 2010

2010/4/15 Steve Campbell <campbell at cnpapers.com>

> I'm trying to move one of our servers behind one firewall to another. I
> can't figure out what might be cached that prevents a smooth move. The
> mailserver is running a caching dns server, but the public IP for the
> mailserver is being moved to the new firewall, so I don't think it's DNS
> causing the problem.
> It appears that when I have the machine moved, after stopping MS (along
> with sendmail), the firewall accepts a telnet on port 25 to another domain,
> but either the firewall or sendmail doesn't receive or accept the returning
> packet. I get nothing in my firewall logs for denials. Any arp tables are
> flushed that are in front of the mailserver and firewall. I do believe I
> discovered that sendmail retains routing information to it's default
> gateway. A check on the firewalls indicate the proper public IPs have been
> removed or installed. Mail travels into the server from the public lan and
> is sent and received behind the firewall. It just won't leave through the
> firewall to the public network.
> Does anyone know of anything I might be overlooking from the mailserver's
> point of view that might be cached and hanging around? A reboot didn't solve
> anything for me, and I have similar mailservers behind the new firewall with
> the same set of firewall rules.
> Thanks for any ideas and sorry for the OT.
> Steve Campbell

I dont want to sound obvious, but did you change the default gateway?
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